Want to just encrypt everything on a node with no network access? Sure. That doesn't work for a "real" host but that is fine if you mostly use your phone and need to just occasionally sync your passwords back at home.

You don't need the things that make hosting hard. You can have a few hours of downtime. You password vault is gigabytes, not hundreds of terabytes. You don't need to arm guard your backups, just pass them (encrypted) to a friend with a safe.